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Segment Reporting (Tables)
 6 Months Ended
Jul. 31, 2019
Segment Reporting (Tables) [Line Items]  
Schedule of Segment Reporting Information, by Segment [Table Text Block] The following table summarizes segment and other results and assets (amounts in thousands):

   Three Months Ended   Six Months Ended 
   July 31,   July 31, 
   2019   2018   2019   2018 
Net sales and revenue:                    
Ethanol and by-products  $105,770   $128,491   $210,223   $249,171 
Refined coal 1   98    266    220    406 
Total net sales and revenue  $105,868   $128,757   $210,443   $249,577 
                     
                     
Segment gross profit (loss):                    
Ethanol and by-products  $6,169   $13,669   $12,284   $27,215 
Refined coal   (2,165)   (4,270)   (4,634)   (6,965)
Total gross profit  $4,004   $9,399   $7,650   $20,250 
                     
Income (loss) before income taxes:                    
Ethanol and by-products  $3,111   $10,077   $6,313   $21,086 
Refined coal   (2,028)   (4,788)   (4,703)   (7,647)
Corporate and other   (352)   (430)   (712)   (931)
Total income before income taxes  $731   $4,859   $898   $12,508 
                     
Benefit (provision) for income taxes:                    
Ethanol and by-products  $(619)  $(2,029)  $(1,105)  $(3,449)
Refined coal   3,155    7,597    7,101    11,596 
Corporate and other   86    63    174    187 
Total benefit for income taxes  $2,622   $5,631   $6,170   $8,334 
   Three Months Ended   Six Months Ended 
   July 31,   July 31, 
Segment profit (loss) (net of noncontrolling interests):  2019   2018   2019   2018 
Ethanol and by-products  $1,305   $6,561   $3,014   $15,150 
Refined coal   1,216    3,018    2,602    4,289 
Corporate and other   (265)   (362)   (539)   (726)
Net income attributable to REX common shareholders  $2,256   $9,217   $5,077   $18,713 
                     
   Three Months Ended   Six Months Ended 
   July 31,   July 31, 
Sales of products, ethanol and by-products segment:  2019   2018   2019   2018 
Ethanol  $83,219   $100,289   $160,837   $192,182 
Dried distillers grains   15,887    21,059    34,561    41,143 
Non-food grade corn oil   4,599    5,075    9,582    10,055 
Modified distillers grains   2,004    2,043    5,144    5,760 
Other   61    25    99    31 
Total  $105,770   $128,491   $210,223   $249,171 
                     
Sales of products, refined coal segment:                    
Refined coal  $98   $266   $220   $406 
1 The Company records sales in the refined coal segment net of the cost of coal as the Company purchases the coal feedstock from the customer to which refined coal is sold.
Assets [Member]  
Segment Reporting (Tables) [Line Items]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Assets:  July 31,
2019		   January 31,
2019		                 
Ethanol and by-products  $406,811   $393,691                 
Refined coal   7,409    8,625                 
Corporate and other   80,485    69,077                 
Total assets  $494,705   $471,393